Changing internal pressure to achieve variable thermal conductivity in thermal insulation
Paper in proceedings, 2015

Cold climates might have a variable need for thermal insulation. When there are large heat loads a low Uvalue is preferable, and opposite when heat loads are low and it is cold outdoors. One way to adjust the Uvalue is to change the gas pressure within the insulation. This would be especially effective in nano-porous materials where the relation between pressure and thermal conductivity is stronger. Measurements have been conducted on an aerogel blanket and a fumed silica material. The results show an almost linear dependence in thermal conductivity at pressures between 1 kPa and 100 kPA for both materials. In the measurements, the thermal conductivity increase by a factor between 1.5 and 2.6 (highest conductivity divided by lowest conductivity).

thermal conductivity

nano-porous insulation

thermal insulation

varied pressure insulation

Adaptive façade

Author

Axel Berge

Chalmers, Civil and Environmental Engineering, Building Technology

Carl-Eric Hagentoft

Chalmers, Civil and Environmental Engineering, Building Technology

Paula Wahlgren

Chalmers, Civil and Environmental Engineering, Building Technology

Bijan Adl-Zarrabi

Chalmers, Civil and Environmental Engineering, Building Technology

Advance building skins: Proceedings of the International Conference on Building Envelope Design and Technology

309-316

Areas of Advance

Building Futures (2010-2018)

Energy

Subject Categories

Civil Engineering

Building Technologies

ISBN

978-3-85125-397-9

More information

Created

10/7/2017